Describe the direction of the current in a wire.

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

How can you increase the strength of an electromagnet?

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero